[R] Newbie: Acf function

[Martin Percossi]

Funny enough, but by accident I typed unclass(acf) (I had meant to 
unclass the *data* obtained as a result of applying this function), and 
I saw the source code! From there I managed to reproduce your steps 
below... In any case, many thanks to all for your help.

Martin

rolf at math.unb.ca wrote:

>Martin Percossi wrote:
>
>  
>
>>Hi, I would like to use acf.plot on a correlogram that is computed 
>>externally. In other words, I would like to "fake out" the acf object. 
>>Is this possible?-- any help would be appreciated.
>>    
>>
>
>        (a) Note that it's ``plot.acf'' NOT acf.plot.
>
>        (b) This is R --- ***ANYTHING*** is possible.
>
>        (c) Create an object, say ``y'' of class ``acf'',
>        having components with the right names.  You could
>        build a dummy acf object by
>
>                > dum <- acf(rnorm(100),plot=FALSE)
>
>        and the examine ``dum'' to see what it should consist of.
>
>        (d) Something like:
>
>                y <- list(acf=array(ecc,dim=c(length(ecc),1,1)),
>                          type="correlation",
>                          n.used=n.ecc,lag=array(0:(length(ecc)-1),
>                                                 dim=c(length(ecc),1,1)),
>                          series="ecc",snames=NULL)
>                class(y) <- "acf"
>                plot(y)
>
>        where ``ecc'' is a vector comprising your ``externally
>        created correlogram'' and ``n.ecc'' is the length of the series
>        from which ecc was created.  Note that the first entry of ecc
>        should be 1; it corresponds to lag 0.
>
>                                        cheers,
>
>                                                Rolf Turner
>                                                rolf at math.unb.ca
>  
>